Wagner Hypothesis in Beam and Column Theory

by Morris Ojalvo, (M.ASCE), Prof. of Civ. Engrg.; The Ohio State Univ. Columbus, Ohio 43210,


Serial Information: Journal of the Engineering Mechanics Division, 1981, Vol. 107, Issue 4, Pg. 669-677


Document Type: Journal Paper

Discussion: Dux Peter F. (See full record)
Discussion: Leko Toma (See full record)
Discussion: Kristek Vladimir (See full record)
Discussion: Trahair Nicholas S. (See full record)
Discussion: Haaijer Geerhard (See full record)
Closure: (See full record)

Abstract: A examination is made on the underlying assumptions on which the flexural-torsional theory of thin-walled members is based. One of them, the Wagner hypothesis, is found not to be needed for the development of a comprehensive theory of rods. Use of the hypothesis is found to lead to the production of behavioral anomalies for axially loaded thin-walled members. A theory not using the hypothesis is found to be possible when it is recognized that the axis of torsional moments passes through the shear center but is directed parallel to the axis of displaced centroids. Results under the two theories are compared for the buckling of angle structs and monosymmetric I-beams. Physical tests capable of identifying the preferred theory are identified.

Subject Headings: Axial loads | I beams | Beam columns | Flexural strength | Rods | Structural behavior | Torsion | Buckling

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